Update to new "except" syntax
Add support for element content

This will allow us to move content from attribute values into their own
elements. This again simplifies escaping of the often used '<' and '>'
characters in the HTML regexes, and opens the possibility of using CDATA
sections which are not allowed in attribute values.
Move the 'regex' attribute into its own element

This is a backwards-incompatible change.
Add support for XPath HTML scaping
Update README with XPath instructions
Simplify the Userfriendly regex
Add feedparser.py to the MANIFEST
Version 3.0